Brockville – Today’s forecast shows clearing this morning. The wind will be out of the northeast at 20 km/h, becoming light this afternoon. Today’s high will be 21, and the UV index is 9 or very high.
Tonight will be clear with a low of 9.
Sunday will be sunny with a high of 25. The humidex is 26, and the UV index is 9 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Wednesday, September 30, 2026